Blood

45% of a drop of blood is made of cells
What kind of cells?

Red Blood Cells

• Haemoglobin: allows blood to carry 100x more oxygen than water can
• There are 500x as many red cells and white

White Blood Cells

• fight disease
• gather to the area where you get cut
• eats bacteria + with it makes pus

Platelets

• fragments of cells
• collect in the capillaries
• form a fence over the wound to stop it bleeding
• fence is called a blood clot

Plasma

• 55% of blood is a watery liquid
• contains digested foods, hormones, a waste and CO2

Task:

• In a group of 8- you will act out what would happen if someone got a cut
• Each group member acts as either: a red blood cell, white blood cell, bacteria or platlet